Removable insulated valve cover

An insulated valve cover for insulating a spence valve interposed in a fluid line which valve has a lower head housing ambient condition sensors and an upper head, which heads have an axis extending generally transverse to the axis, and on opposite sides of, a valve body, said axis extending in a direction in which fluids conducted through the line flow, comprising:

• a substantially rigid main section, elongated in the direction of fluid flow and formed arcuately with respect to the axis of the valve body, said main section including an integral cap portion including an axis extending generally radially with respect to the axis of the valve body to enclose the upper head of the valve, and including a first arcuate edge circumferentially opposite said cap portion, and a second arcuate edge spaced from said first arcuate edge, and
• a substantially rigid auxiliary section elongated in the direction of fluid flow and formed arcuately with respect to the axis of the valve body, said auxiliary section having a first arcuate edge and being removably disposed relative to said main section said auxiliary section further including a second arcuate edge, said auxiliary section respectively abutting said first and second respective arcuate edges of said main section to circumferentially enclose the valve body,
• whereby said main section will remain suspended from said valve by said cap while said auxiliary section is positioned to complete said cover.